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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47198795d6bb57bf5e191132d7cee9facac13dc6e595048e3a86bec843e6d124' 
  AND token = 'eL0InwKZYAW67Tjt7CrQFO7wo9Oe/g/YCVeBtiEZbsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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