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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e692762b692050528f91f3474ce8b746c6ee9c0f4f7420a095c05f7c9d546d4c' 
  AND token = 'HXg9P4xp/hvVf1cCZd49px61e/ynIBvvSGR+W1pCV3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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