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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815917037c39cebe449f9a35ead2af47c45a6a1a65531a660cc5780f97a41528' 
  AND token = '2F0B4Ach0moznzDrh4EtQmfT1pR2ZJEIMD780Gm7bsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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