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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d34c63c5ae5b73edbe6ae0670a619f5805dc30eae373c14f1169c12b0f9e51' 
  AND token = 'SewKa+NZ8OO1UpIvePDy8mGdIoQRQgYYSEmnSRIZFvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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