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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4758e3afebe56b21fcc53e624f7bd2c298b871df2b799f3e9b637ba5c394fbfa' 
  AND token = '8it4iTAt4eaZdRG1n60GOCtiK92s0TOQGJffWRYBAlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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