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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55172bc08713e05a7a7030905ec993767110b4bbc2c39065b3b3e179b6dbce9' 
  AND token = 'EdJn94jA1/tmg7lISJZ3KPnCTAsyqWOdEUHq5wjJ3F8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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