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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3edae1bc6bee4c9a7712c401acc8db987c8bdf087e7691fd38a66a4a13737e23' 
  AND token = 'Q27cDOOJXIZuSzAx0h21Fv5hI2IaFrOY8QzkjHHLLx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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