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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '084710c8cb1124ec45c6f3cf67de059b1b8ceb8f1dbdd4db5e42ee7e7e492481' 
  AND token = 'JV4BlmG50Q7XPvy1NT990GKMBhMKFGz9VZqaOSP4c6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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