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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8d844b5d471c202c149ce8ea38a2c66cfe9c1e85ce6f94da7b9c68011d2d3f' 
  AND token = 'ry+wXSD+hjk4CZ14Sw9mSeYTyvEpXM+kxWdAW6stsRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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