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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adab7f3bfb708c5b8ea0982e7eaa086043f6ee0c951b10bd99f6bc8e2476820b' 
  AND token = '2WBLFb1xLHs71fKycZIgRDl1TqJ/pmVmfytED5KDQlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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