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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9420fbabd8da64a2d5d9e74b2c9a70e012ba2ef0996d36001c09dd87e2a30700' 
  AND token = 'R0sWwDzCScmF4KvIv0VznpcCgcym0EEV/+0eeEqoF3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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