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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06099c9b523a4a68f75e2bbb58dffa99bbb3235c517f4c171d0fbd9f8c79d6d' 
  AND token = 'R7bhVjAZOTOi+96GNL3i0Vc340yFAkm4oC3ozc/koOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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