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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326d126c904ab8f3284792a8c0db98455ab9a159514a98934f92aa6828640e88' 
  AND token = 'l/Ssu1Bt6IV3n796VTb7lbnQK6sronL+EP0NV9NIbF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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