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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd1a4ae924f6c7ee934209d1496ff47950f67d9742c1d4f18ad8fc07a661afd' 
  AND token = 'KEUlmjrskRsFyCmPHABykXt5p63LQ8FBFg25KhTk/HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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