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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ce30f922dab6e7f43f23e28f0c8353638e35d018d3366423c68a51741ca9ce' 
  AND token = 'f2silO5rQaBrkaqrcKkyW7vQ8q9Rgieqe/K8KTcSx7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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