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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095eea63828d723b35bc532afd7c73a2d9e62ed18d0b6e6d64a57327445a01d5' 
  AND token = 'rIpvaIGt9p5eEAtDThwdWSynlm+R2Z9q1DrCGMeZY9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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