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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e8f82164651a9e745cd64e38cc7b6690a07cea1613d3fed5820f6af57076d8' 
  AND token = '8J21A4OnMWXnv0SZVq9wgsPkXBekAt1xdy/vrfrtax8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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