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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ee73b74e2bd90e1302a36b37d4f6e93d6283c9219ccbfdc4edfae0aeb86575' 
  AND token = '046mU59JHnNaE548S3Np1bprFFBvhO3S0l4IO8FYMnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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