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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad86a664da323773b40436d32305ea8f2381d762fdb076ef242e64b5e59ed5e' 
  AND token = 'K9vODoIn2zRiwMUDXKTABQ7Y2u8fT84xfCyQ2a0f2Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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