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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c0e1388dc68cca463ca3949d0b783bfd31417da1751b810706622226fe6445' 
  AND token = '7wvXHVFpmScPlBEra5mltyDHlUr3dEeflV/MSyA52jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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