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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d63a1d4f4dfa76c4de618c9dd8fd202d0b7e682bebfaf899e3f34e82a2a987f' 
  AND token = 't+7oi5S2LkAC0xDcUpzfYzWLO374+DGvHop5ccnQxy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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