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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec705f9bbf26a7462ea21387bef7ff1b60c4e4e4f5ea71eb3dd251e8c30eb5f' 
  AND token = 'KU2bA/ukgqgQ/Rp5e7MetSxeS/83Kn4kt8jaGdRVXRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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