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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7461201f688a31d6ed071a2f750a201fdf6160d852790bed3cb80d1161fd01e4' 
  AND token = 'm7jQHawspSMQDZE+yeJPc9w6UVs88lITTPUgYCFzpG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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