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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdec3e18187c47a90cd735eb332edec71852fd15c71a4004e879ed358697be5d' 
  AND token = 'F01SPx9dmuaVCK9yOB9SmoWOl4TLaRVAgGMzl9p6wwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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