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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb665a922e87556d42bdab3d2b2451b5d73cdf1cba6c83511ef7594362519113' 
  AND token = 'ZyUhQo1w3eUyKLiEY5zyFn1poVMo7x3FLcW/Mh+bcS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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