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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdcffb4ee23f8e0b98af73699ddcfddd2d9376090ca9e7e9027431e8ca5eb633' 
  AND token = 'JXZc7GWwFHTiSWCqHSg0M2bIAAm5MiE8OkOK/R7+jEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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