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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd99163bb92ee0205b1f3da6e14989c14f14eaf52f17bc36ac0ac5753c05626' 
  AND token = 'bhm2L0ACknItfRUNW2XZxasggUl2gKUNSfuyjBFbT0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00795

JSON explain

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