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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fecb973d4386a46e6948ca94c11619ea252eceb619a4d0ccd951f878aa9c64' 
  AND token = 'U0SrwfJXlVTZQk5YgwPOiKwncm6vW77xVXfl73gcwWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00131

JSON explain

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