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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3097652a69801ae7c58b1cdc3bb151cee75b4d34545141420216a123ece281' 
  AND token = 'bno9/bdZlzR+GSrqaP+F2c6t+qZ2AX4JEocZeYCASvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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