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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedbb06071f9188f425d7d5f4ec7a7264118c841de3db9f825a1d046d325e23d' 
  AND token = 'PGJCdg06H/Z48XhrYIjLNW7NcTEAslyfMCX6Tzpo23g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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