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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc92810839b1cc3e511ce63c12cbba1a40b918ea05a562ba9df1e35dded3e8a2' 
  AND token = '9ekj0KnB632r0o2+2XdnRrTieoicPnRFejI8lHsfalk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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