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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34263b69a4ce8e89495312d23df1a733dbd2475a1531720fcb6c09512c61335' 
  AND token = 'jRJuNBGRnzQvgW75urGX57i5zwIP6C4Io97Gxuj5U5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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