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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3946777585a5c7a0d5f3efb0a1cb1d03021cc4e99bece02c7c8ed6e1b3a3cbf' 
  AND token = 'RrsKn90m58I/EEDSEY2BVfYuAH5Zkvd0EhvgIDn+01k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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