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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e769d4d6703a989c317f5566d3d814f898ebbcdf2dbe4d8a7d6ff47290c00de' 
  AND token = '6iuzZyI7TcfEunO1A3phSJRVALQLla1w7SSuPe3S52k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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