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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67ce7856a9b93111c7eb5362d05366f8717f5136303d22049eb56d34c9e5ec3' 
  AND token = 'Am8TGm9b57Vvtta5vRtyzR6mfbmWwhs9uJ3UL79GBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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