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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6d272b18e7e3cdc0a3e15296038fcb6d9c8d4c1b8364ef6d1b4ac8b4415f2f' 
  AND token = 'SHOB9Bbl7B22Lj07evUnQOO/fYlNEZ3+J+dGb57hEYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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