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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b3d132c8f4e33f4c59d522f38773117f797c251e038a033df5b74fdf5d8ba3' 
  AND token = 'lbzGJok+Kn2yDE/UelOE39tluOpuxdmpfNE1Z0JofPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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