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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1431be04bf3a62fd121d17ac88f85160d93c25d3280baf7234ff553b0e78db2e' 
  AND token = 'vJ0hZ8GRuNndfdG6oSJNjeC/7D7JUiCgGEUQ2RY0PxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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