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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b372745acd1e7251310d1c5b6a5bf335ee23f029bbb5c8b218ae4fc5bbbf54' 
  AND token = 'l7BnCvohO+PjhQ2i9u/Gm5CuQw0/tKKHGEYYP8bc0kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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