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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d8ec14170d55985f37664b84b8bc2cc50f1b61b55f5933f2609e29761b1077' 
  AND token = 'J9yOpfSdfKvZkVu17SPiZyNF+qt9M+D39UJ/pHpPa2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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