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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f98a2dc9643e9055bbb839497ce4b1ce55aa4353539ce6b92ed942900ab945' 
  AND token = 'SI9D8qU5aR6IMeK5X286X4QUMcNK47kLqHwIfnBK1bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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