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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a0d9e7e1b875a66246e3a5efdab32c412e59c75e1ab4f8aa5b4f700d595466' 
  AND token = '8kk7bRS8Bco3vCG7UoT9+xV5yhvMjSN/spnCxjX51KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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