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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418de48be93eb24327fe3262d10eaadb4eebf2b3dbc27187e30f95882afcb4f1' 
  AND token = 'jLJlvknqgojvxgAQki/XA5tBSd4gxLsL8nT4Z98h16I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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