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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977e9dc6225e8be44289639cdb85f57e84bca11cb832daf4935c52f00bff581c' 
  AND token = 'iZ+sOIawdHsMc0zHsuONKJhCgUqAR1B0Kkcx6Q32n28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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