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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7687a7ac8d3202bf780492b02b9cfce95d167717841d40a03359463d57e584ac' 
  AND token = 'dgD86+Ihb1lUR1AW7pjEDyLX0oJMl0/YL6HP56Fi23M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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