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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3eae0e63d9bb88822c52357e103e6df6a9f5244637b76f5fb0263a0ad3f0d70' 
  AND token = 'oLdKDvBTcweJ+tNGHZZGPxTDFn52c0F7R8kHHEtpHaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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