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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6794847f619eb2e1e99da91d1f244c53b8d409ca6dd21dd68584546b3d547812' 
  AND token = 'AC6DX9ROKq+2rDdp728HYqdaTcCacw9RMfOWoaU+KCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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