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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7839e7d25a5918b99fcd3d22b282930bd458906da03f8dd989092c5b55da2f9' 
  AND token = 'Q6AZ+Zwl94jmz+cAz67jilubYzXPchamIp3R6Zxm30k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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