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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6b4947d0e8adaae88062ad04d4489eb18534da811c9be283a9ee43eef9017b' 
  AND token = 'bucgvdD+g620wfyBz+AwIly0LxsyFY6OST6+vTywHsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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