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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439c131db4af98ad41d93d26e5e209142a28186521dbb94547667b9e76cc21a0' 
  AND token = 'dQqZDFJ6xRHxETkASV3tND1JG1XgqGsY47K8dP1d1ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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