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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaa231cb3438e6a768b4d254548cb7835dc49cf10a60cebc7294a74d3e19d02' 
  AND token = 'Br0Km7WNTSrecsDRLDRfBtQ3aNT9/6nDewYzvN+fZIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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