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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf0f438249a5defd9742789d4987942e02dad21cf8cf7c1f673c86aaaa4982b' 
  AND token = 'IO3206NXmhPfQnBT9a/a0cwnsBXOtGNcwTOD0jXwt8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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