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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '318be89f811319062894516fadb67c290d55ca096698179aedeb5fe61212004b' 
  AND token = 'yGABuz9fgcenOVaa48p2Y9Em3w1rRNXY3HuTVq+AZko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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