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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539b0257ef2033ba87d0e05bcf2db02b953defdf6b5973227fdf015f2607f811' 
  AND token = 'toG6H7+XjtoO8jPvC7J1GHbjhMVIPhR3IOAyO4UEmhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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