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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c930b5f3096e3b63a1e3269cd5dbb0873022d66e45ac1f54c6d7589a01cddce' 
  AND token = 'XojCdHy9ACIk0JdBdczfeR0FUAwnDHp5AFlaD9poyao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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