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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8e86ecf048fffbd0cf5e8ff386ef5cd865d6dbd83ca9b45d387b2d755d41f6' 
  AND token = 'qqPrg9d1+TUNYTJU57AxFKl22lMTzOucO7bqzw/xQXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}