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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70967f15ec6bd926046e5c79eb741cd49660d010cbe43d82ae6c9593f7f98cba' 
  AND token = 'm6U8ooo6JWBScfAExnRLlJo8HZxvhunXjzhK+xN1zmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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