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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '064781b79bd8d0fd27308321428f375970b8908a2c4a7e7050a7f8572b19b1a1' 
  AND token = '/EyCKHHV58LxAZyphpaDlqbneBjsDx6m40cGNUrbyNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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