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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9cea0138b4a5ad53bf6e67e84585da980697f1980e0adc7ae3baa4fa9cb52ab' 
  AND token = 'SJg5jwrpisZ/J9hdGVSZAGTkcxqJc5JEFkk3mbx8bKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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