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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860514f2edf43cd0e5ae12c2d71e18687eaa116c9657aa62cefdcb79673d9e05' 
  AND token = 'lRXph4lnDzpDRlqk56v45x/QUHQ9xCL6+/Pk7CrDS24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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